Rex A Couture

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Apolipoprotein E phenotypes and plasma lipid and lipoprotein levels were determined in 435 individuals (233 men, 202 women) of French Canadian descent living in northeastern Quebec. This region is known for its high frequency of mutant genes responsible for rare genetic disorders. Total cholesterol, low-density lipoprotein (LDL) cholesterol, high-density(More)
BACKGROUND A low dietary intake of vitamin D and calcium hastens bone loss and osteoporosis. Because vitamin D metabolites may also alter the inflammatory response and have antimicrobial effects, we studied whether the use of vitamin D and calcium supplements affects periodontal disease status. METHODS A cohort of 51 subjects receiving periodontal(More)
OBJECTIVES To devise and test for reproducibility a new patient-beam alignment device for subtraction radiography. METHODS A rigid, cross-arch bar was used with bite-registration material. A modified Rinn XCP rod and ring were firmly attached to the bar and were placed in contact with the X-ray cone. The receptor was held by a slot in the bar. Duplicate(More)
OBJECTIVE The purposes of this report are to present a quantitative model for digital oral radiography and to evaluate a new photostimulable phosphor system for bone mass measurements. STUDY DESIGN Noise, linearity, and precision were measured from stepwedge images and blank images through use of a special least-squares calibration method. The model was(More)
Highly saline and caustic tank waste solutions containing radionuclides and toxic metals have leaked into sediments at U.S. Department of Energy (DOE) facilities such as the Hanford Site (Washington state). Colloid transport is frequently invoked to explain migration of radionuclides and metals in the subsurface. To understand colloid formation during(More)
BACKGROUND A previous study reported by this group found that patients in periodontal maintenance programs taking vitamin D and calcium supplementation had a trend for better periodontal health compared to patients not taking supplementation. The objective of the present study is to determine, for the same cohort of subjects, whether such differences(More)
Photostimulable phosphor radiography (PPR), a mature industry in medical imaging, became available in dentistry in 1994. At least three dental PPR systems have been made available commercially since that time. Although dental PPR offers a number of advantages over film-based methods, some aspects of dental PPR need improvement. Further research is needed to(More)
OBJECTIVES The aim was to demonstrate methods for determining measurement precision and to determine the precision of alveolar bone measurements made with a vacuum-coupled positioning device and phosphor plate images. STUDY DESIGN Subjects were rigidly attached to the x-ray tube by means of a vacuum coupling device and custom cross-arch bite plates.(More)